Php substr truncation of Chinese characters garbled solution

The substr () function returns part of the string.

Syntax

Substr (string, start, length)

Example 1

The code is as follows:	Copy code
<? Php Echo substr ("Hello world! ", 6 ); ?> Output: World!

Example 2

The code is as follows:	Copy code
Echo substr ('China', 1 );

The result is a chip. Later I learned that the difference between Chinese and English is the internal encoding. A website says that the substr function intercepts characters in bytes, chinese characters are encoded in GB2312 as two bytes, and UTF-8 as three bytes. Therefore, if Chinese characters are truncated when a string of the specified length is intercepted, garbled characters are displayed in the returned results.

Solution

1. Use mb_substr to intercept

 

The code is as follows:	Copy code
<? Php $ Str = 'so that my string will not contain garbled characters ^_^ '; Echo "mb_substr:". mb_substr ($ str, 0, 7, 'utf-8 '); // Result: Echo "<br> "; Echo "mb_strcut:". mb_strcut ($ str, 0, 6, 'utf-8 '); // Result: ?>

However, if you want to use mb_substr to intercept data, you need to use the mbstring Extension Library. If you do not have the permission, you can refer to the following function.

The code is as follows:	Copy code
Function msubstr ($ str, $ start, $ len ){ $ Tmpstr = ""; $ Strlen = $ start + $ len; For ($ I = 0; $ I <$ strlen; $ I ++ ){ If (ord (substr ($ str, $ I, 1)> 0xa0 ){ $ Tmpstr. = substr ($ str, $ I, 2 ); $ I ++; } Else $ Tmpstr. = substr ($ str, $ I, 1 );   } Return $ tmpstr;  }